Yes, all silver coins in world heritage and Buddhist mountain series are 2 oz. These two series are the most popular among collectors inside China. Even with a high mintage of 60,000, the current fair value of silver coins is in the range of $350-$450. The grotto set is not in those series, but 2 oz. silver grotto, with mintage of 20,000, has a current valuation of $750-$850 and wg owns ton of this coin, based on the picture he posted in this thread.